The invention relates to an adjustable hanger board assembly for mounting tools to a wall, the inside of a vehicle compartment, on a wall, on a ceiling on a floor or other flat surface. Each hanger board assembly has a plurality of horizontal slots and/or vertical slots and or angular slots and optionally a repeating pattern of mounting through-holes capable of accepting a wide variety of existing fastening hardware and tool brackets. The fastening hardware is adjustably fastened along the horizontal slots and/or vertical slots and or angular slots which serve as mounting tracks for hanging brackets and other tool securing devices. The fastening hardware is similarly adjustable in a plurality of through-holes in the hanger board assembly.